Black-headed Gulls are a familiar sight in Britain with over 200,000 breeding pairs. The bird is named incorrectly, in my opinion as it never actually has a black head. In the summer the adults have a dark chocolate hood and in the winter months (as in the photos above) it has a white head due to the hood being moulted. It is a beautiful bird though, with wax red legs and bill and slim, pointed wings with an obvious white stripe along the front edge.